Caption: Egg selection for IVF. Technician using a microscope to select harvested ova (eggs) for use in in vitro fertilisation (IVF). The chosen ova will be injected with sperm to fertilise them and the resultant zygotes will be grown in the lab until they reach an early stage of embryonic development. They will then be implanted into the patient's uterus. This can result in multiple births. IVF allows infertile couples to conceive a child.